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Design and Proof-of-Concept of a Matrix Transducer Array for Clamp-On Ultrasonic Flow Measurements.

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    Summary

    This study introduces an array-based ultrasonic flowmeter that self-aligns, improving accuracy for various liquids and pipe sizes. This noninvasive technology enhances flow measurement efficiency and reduces manual calibration needs.

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    Area of Science:

    • Acoustic Engineering
    • Fluid Dynamics
    • Instrumentation and Measurement

    Background:

    • Clamp-on ultrasonic flow meters offer noninvasive flow speed measurement but require manual transducer alignment, which is complex and prone to errors.
    • Manual alignment is sensitive to pipe properties, imperfections, and complex pipe geometries, limiting practical applications.
    • Matrix transducer arrays can overcome these limitations through dynamic beam steering and self-alignment capabilities.

    Purpose of the Study:

    • To design and evaluate a broadband matrix transducer array for self-aligning clamp-on ultrasonic flow measurements.
    • To assess the feasibility of using array-based systems for flow metering across diverse liquid types and pipe dimensions.
    • To investigate critical aspects including efficiency, electronic beam steering, and wave mode conversion for improved flowmeter performance.

    Main Methods:

    • Design of a 37x17 matrix array (1 MHz center frequency) for clamp-on ultrasonic flow measurement.
    • Fabrication of a prototype using two 36-element linear arrays (1.1 MHz center frequency).
    • Experimental setup on a stainless steel pipe with water, measuring array efficiency and flow speeds using electronic beam steering and compressional/shear waves.

    Main Results:

    • Simulated and measured array efficiencies in water were comparable (0.88 and 0.81 kPa/V at resonance).
    • Successful mean flow measurements were achieved via electronic beam steering.
    • High correlation coefficients between measured and reference flow speeds demonstrated the system's operational concept.

    Conclusions:

    • The developed array-based clamp-on ultrasonic flowmeter concept is operationally viable.
    • Matrix transducer arrays offer a promising solution for automated, accurate, and versatile noninvasive flow measurement.
    • This technology has the potential to simplify flowmeter calibration and expand applications in challenging environments.